Hi @EugeneT.37507 (Customer)​ , thank you for contacting Okta Community.

I've tried to reproduce the scenario in a test org using Mailchimp. From the app's Sign On tab, click edit. Under the Credentials Details section, you can select (None) for the Application username format (see screenshot).

Once you save this setting, you need to assign the app. Because the administrator sets the password, assignment through groups is not recommended. Instead, choose to assign it to people. Go to the Assignments tab, click the blue Assign button and select Assign to People. After you find a user and click Assign, you will see a pop-up asking you to set up both the username and the password for the user's access to the SWA app.

Let me know if you run into any trouble along the way.

Regards. 

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Ok. Thank you.

That seems to make sense to me however i cant test it yet

Why not?

The app i am working on is corporate YouTube channel which uses Google account.

Which, in turn using 2-page login method with username on 1st page and password on the 2nd.

It seems to be quite involved to figure all those fields out for the template i found called - Template Two Page Plugin App

Would you be able to help me with settings